/Engine/Source/Runtime/Engine/Public/AudioDevice.h
Stop sources that need to be stopped, and touch the ones that need to be kept alive Stop sounds that are too low in priority to be played
void StopSources ( [TArray](API\Runtime\Core\Containers\TArray)< [FWaveInstance](API\Runtime\Engine\FWaveInstance) * > & WaveInstances, int32 FirstActiveIndex )